Formula of Love: O+T=＜3

Formula of Love: O+T=<3 is the third Korean studio album (sixth overall) by South Korean girl group Twice. It was released on November 12, 2021, by JYP Entertainment and Republic Records. It consists of sixteen tracks, including the group's first English single, "The Feels", and lead single "Scientist". The album is primarily a disco-pop and synth-pop record that also incorporates other genres such as Latin pop, hip hop, and R&B.

Formula of Love: O+T=<3 received universal acclaim and was a commercial success. The album sold over 700,000 units during its pre-order period and became Twice's best-selling album to date, surpassing a record previously held by More & More (2020). It debuted at number three on the Billboard 200 with 66,000 album-equivalent units, becoming the group's fourth and highest entry on the chart.